Without any options smartctl shows:
Unknown USB bridge [0x059b:0x0475 (0x100)]

smartctl -d usbjmicron works:
Model Family:     SAMSUNG SpinPoint F2 EG
Device Model:     SAMSUNG HD103SI

This is an Iomega GDHDU2 1TB external USB HD.
It is not listed in usb.id either, please add it there too.